1. 建andriod项目
先打开andriod建一个项目,并创建一个空的activity
2. 配置layout
app\src\main\res\layout\activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="确认"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toLeftOf="parent"
app:layout_constraintLeft_toRightOf="parent"/>
<EditText
android:id="@+id/password"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPassword"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="@+id/button"
app:layout_constraintRight_toLeftOf="parent"
app:layout_constraintLeft_toRightOf="parent"
android:text=""
/>
<TextView
android:id="@+id/warning"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/colorAccent"
app:layout_constraintLeft_toLeftOf="@+id/password"
app:layout_constraintTop_toBottomOf="@+id/password" />
</android.support.constraint.ConstraintLayout>
3. 编写MainActivity
package com.你自己的包名;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.util.Date;
public class MainActivity extends AppCompatActivity {
EditText pwd;
TextView warning;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
warning = findViewById(R.id.warning);
Button bt = findViewById(R.id.button);
bt.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
String txt = pwd.getText().toString();
String password = "123"; // 这里随便写个测试密码123
if( txt.equals(password) ) {
Jump(v);
} else {
warning.setText("密码错误");
}
}
});
pwd = findViewById(R.id.password);
}
public void Jump(View view){
Intent intent = new Intent();
intent.setClass(MainActivity.this, Main2Activity.class);
startActivity(intent);
}
}